This is exactly what I need! How did you mount it in the utilitrak?Rockymounts Clutch SD (now called the "Driveshaft HM"):
These can do 20mm thru-axle, 15mm thru-axle, and 9mm skewer/QR - super versatile. They're built really strong (they're heavy!), the bikes don't move or sway at all when mounted, and the built-in key locks sealed the deal for me.
They have less expensive ones that only do 9mm QR, but since I mountain bike I needed this one.
I like that one, it wasn't out yet when I bought mine back in 2014. Although I wonder if it'll fit underneath my TonneauI have a very similar mount, made by Rocky Mounts. What I like most is that the center bolt that holds it in can't be accessed by a Torx tip when it is locked. The locking latch folds down in front of it. So someone can't steal the mount even when my bike is out of it.